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</style>
<title>Session</title>

</head>
<body>
<h1>Session</h1>

<ul>
<li><a href="#configuration">配置</a></li>
<li><a href="#session-usage">Session 用法</a></li>
<li><a href="#flash-data">闪存数据</a></li>
<li><a href="#database-sessions">数据库 Sessions</a></li>
</ul>


<p><a name="configuration"></a></p>

<h2>配置</h2>

<p>因为 HTTP 驱动的应用是无状态的，Session 提供了一种在请求中保存用户信息的方式。Laravel 自带很多可用的 Session 后端，并提供了整洁统一的 API。常见的后端比如 <a href="http://memcached.org">Memcached</a>、<a href="http://redis.io">Redis</a> 以及数据库可以立即进行使用。</p>

<p>Session 的配置存放在 <code>app/config/session.php</code> 文件。请确认浏览了该文件中已经详尽注释的选项。在默认情况下，Laravel 被配置为使用 <code>native</code> 原生的 Session 驱动，这在大多应用中都能够很好的工作。</p>

<p><a name="session-usage"></a></p>

<h2>Session 用法</h2>

<p><strong>在 Session 中存储一个变量</strong></p>

<pre><code>Session::put('key', 'value');
</code></pre>

<p><strong>从 Session 中获取一个变量</strong></p>

<pre><code>$value = Session::get('key');
</code></pre>

<p><strong>从 Session 中获取一个变量或返回一个默认值</strong></p>

<pre><code>$value = Session::get('key', 'default');

$value = Session::get('key', function() { return 'default'; });
</code></pre>

<p><strong>检查一个变量是否在 Session 中存在</strong></p>

<pre><code>if (Session::has('users'))
{
    //
}
</code></pre>

<p><strong>从 Session 中删除一个变量</strong></p>

<pre><code>Session::forget('key');
</code></pre>

<p><strong>从 Session 中删除所有变量</strong></p>

<pre><code>Session::flush();
</code></pre>

<p><strong>重新生成 Session ID</strong></p>

<pre><code>Session::regenerate();
</code></pre>

<p><a name="flash-data"></a></p>

<h2>闪存数据</h2>

<p>有些时候您可能希望只为下一次请求在 Session 中存储一些数据。您可以通过使用 <code>Session::flash</code> 函数实现：</p>

<pre><code>Session::flash('key', 'value');
</code></pre>

<p><strong>为下一次请求再次存储当前闪存的数据</strong></p>

<pre><code>Session::reflash();
</code></pre>

<p><strong>为下一次请求再次存储当前闪存数据的部分数据</strong></p>

<pre><code>Session::keep(array('username', 'email'));
</code></pre>

<p><a name="database-sessions"></a></p>

<h2>数据库 Sessions</h2>

<p>当使用 <code>database</code> Session 驱动，您需要建立一张表保存 Session 数据。下面是这张表的模式声明的一个例子：</p>

<pre><code>Schema::create('sessions', function($table)
{
    $table-&gt;string('id')-&gt;unique();
    $table-&gt;text('payload');
    $table-&gt;integer('last_activity');
});
</code></pre>

<p>当然，您也可以使用Artisan 命令 <code>session:table</code> 为您生成这个迁移:</p>

<pre><code>php artisan session:table

composer dump-autoload

php artisan migrate
</code></pre>
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